[英]Swift4 - JSON Decodable issue with array (Cannot subscript a value)
I'm parsing weather JSON using Swift 4 Decodable, and i have an issue with array data. 我正在使用Swift 4 Decodable解析天气JSON,并且数组数据存在问题。 I'm think i may be a bit wrong with model (because there are bunch of decodable structs), please help. 我认为我可能对模型有点错误(因为有很多可解码的结构),请帮忙。
JSON Data from the weather API: 来自天气API的JSON数据:
{"coord":{"lon":-43.21,"lat":-22.9},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],
"base":"stations","main":{"temp":299.37,"pressure":1008,"humidity":51,"temp_min":296.15,"temp_max":302.15},
"visibility":10000,"wind":{"speed":4.1,"deg":320},"clouds":{"all":0},
"dt":1510909200,"sys":{"type":1,"id":4565,"message":0.0023,"country":"BR","sunrise":1510905615,
"sunset":1510953350},"id":3451190,"name":"Rio de Janeiro","cod":200}
Model: 模型:
struct WeatherData:Decodable {
let coord:CoordDict?
let weather:[WeatherArr]?
let base: String?
let main:MainDict?
let visibility:Int?
let wind:WindDict?
let clouds:CloudsDict?
let dt:Int?
let sys:SysDict?
let id:Int?
let name:String?
let cod:Int?}
struct CoordDict:Decodable {
let lon: Double?
let lat: Double?}
struct WeatherArr:Decodable {
let id: Int?
let main:String?
let description:String?
let icon: String?}
struct MainDict:Decodable {
let temp:Double?
let pressure:Double?
let humidity:Int?
let temp_min:Double?
let temp_max:Double?
let sea_level:Double?
let grnd_level:Double?}
struct WindDict:Decodable {
let speed:Double?
let deg:Double?}
struct CloudsDict:Decodable {
let all: Int?}
struct SysDict:Decodable {
let type:Int?
let id:Int?
let message:Double?
let country:String?
let sunrise:Int?
let sunset:Int?}
Parsing JSON data using JSONDecoder: 使用JSONDecoder解析JSON数据:
let jsonUrlString = ("https://api.openweathermap.org/data/2.5/weather?lat=\(lat!)&lon=\(lon!)&APPID=\(apikey)")
guard let url = URL(string: jsonUrlString) else { return }
URLSession.shared.dataTask(with: url) { (data, response, err) in
//check err
if err != nil {
print("Error:\(String(describing: err))")
}
guard let data = data else { return }
//do stuff
do {
let weatherData = try JSONDecoder().decode(WeatherData.self, from: data)
print(weatherData.name, weatherData.weather)
//Here i can't parse the weather Array, and get xcode error
if let wArr = weatherData.weather! as? Array<AnyObject> {
if let weatherIcon = wArr["icon"] {
icon = weatherIcon
}
}
} catch let jsonErr {
print("Error:\(jsonErr)")
}
}.resume()//URLSession
ERROR msg: Cannot subscript a value of type 'Array' with an index of type 'String'. 错误消息:无法用索引类型“字符串”下标“数组”类型的值。
How can i fix this? 我怎样才能解决这个问题? How can i parse weather array elements? 我如何解析天气数组元素?
Declare weather
in the WeatherData
struct as non-optional. 在WeatherData
结构中声明weather
为非可选。 There is always a weather 总是有天气
let weather : [WeatherArr]
Get the first item if the array and the icon 如果数组和图标获得第一项
if let currentWeather = weatherData.weather.first {
if let weatherIcon = currentWeather.icon {
print(weatherIcon)
}
}
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